package com.ttbj.util;


import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;

public class JsonTools {
	    private static Gson gson = null;
	    static {
	        if (gson == null) {
	            gson = new Gson();
	        }
	    }

	    private JsonTools() {
	    }

	    /**
	     * 转成json
	     * @param object
	     * @return
	     */
	    public static String GsonString(Object object) {
	        String gsonString = null;
	        if (gson != null) {
	            gsonString = gson.toJson(object);
	        }
	        return gsonString;
	    }

	    /**
	     * 转成bean
	     * 
	     * @param gsonString
	     * @param cls
	     * @return
	     */
	    public static <T> T GsonToBean(String gsonString, Class<T> cls) {
	        T t = null;
	        if (gson != null) {
	            t = gson.fromJson(gsonString, cls);
	        }
	        return t;
	    }
	    
	    public static String MapToJSON(Map<String,Object> map){
	    	String json =null;
	    	if (gson != null) {
	    		json = gson.toJson(map);
	            }
	    	return json;
	    }

	   /**
	     * 转成list
	     * 泛型在编译期类型被擦除导致报错
	     * @param gsonString
	     * @param cls
	     * @return
	     */
	    public static <T> List<T> GsonToList(String gsonString, Class<T> cls) {
	        List<T> list = null;
	        if (gson != null) {
	            list = gson.fromJson(gsonString, new TypeToken<List<T>>() {
	            }.getType());
	        }
	        return list;
	    }

	    /**
	     * 转成list
	     * 解决泛型问题
	     * @param json
	     * @param cls
	     * @param <T>
	     * @return
	     */
	    public <T> List<T> jsonToList(String json, Class<T> cls) {
	        Gson gson = new Gson();
	        List<T> list = new ArrayList<T>();
	        JsonArray array = new JsonParser().parse(json).getAsJsonArray();
	        for(final JsonElement elem : array){
	            list.add(gson.fromJson(elem, cls));
	        }
	        return list;
	    }


	    /**
	     * 转成list中有map的
	     * 
	     * @param gsonString
	     * @return
	     */
	    public static <T> List<Map<String, T>> GsonToListMaps(String gsonString) {
	        List<Map<String, T>> list = null;
	        if (gson != null) {
	            list = gson.fromJson(gsonString,
	                    new TypeToken<List<Map<String, T>>>() {
	                    }.getType());
	        }
	        return list;
	    }

	    /**
	     * 转成map的
	     * 
	     * @param gsonString
	     * @return
	     */
	    public static <T> Map<String, T> GsonToMaps(String gsonString) {
	        Map<String, T> map = null;
	        if (gson != null) {
	            map = gson.fromJson(gsonString, new TypeToken<Map<String, T>>() {
	            }.getType());
	        }
	        return map;
	    }
	    
	    
	    
	    
	    public static Map<String,String> GsonToMap(String gsonString){
	    	 Map<String,String>  map = null;
	    	  if (gson != null) {
		            map = gson.fromJson(gsonString, new TypeToken<Map<String, String>>() {
		            }.getType());
		        }
		        return map;
	    	
	    }
 
	    
	  
	}
